IC
4603 is part of the colourful Rho Ophiuchus Nebula Complex and is framed in the
center of the image. The bluish clouds are formed by interstellar dust shining
because the light reflected by the stars. The yellowish nebula comes out of the
material ejected by giant star Antares which is not in the image, but its
reflection can be seen in the left side. At the right it can be seen the
incipient shapes of the Rho Ophiuchus nebula complex
IC 4604 Dense dust clouds are opaque to
visible light and can completely hide background stars.